TrainCreateOrderRequest

{
    "customOrderId": "EXT-TRAIN-20260715-001",
    "shoppingId": "train_shop_01J2X9D8Q1",
    "journeyId": "train_journey_G1_20260720",
    "returnJourneyId": "train_journey_G2_20260725",
    "contact": {
        "name": "ZHANG SAN",
        "gender": "male",
        "email": "contact@example.com",
        "phoneRegion": "+86",
        "phone": "13800138000",
        "zipCode": "100000",
        "city": "Beijing",
        "streetAndNumber": "No. 1 Railway Street"
    },
    "passengers": [
        {
            "id": 0,
            "givenNames": "SAN",
            "surname": "ZHANG",
            "gender": "male",
            "birthday": "1990-01-15",
            "passengerType": "adult",
            "travelDocumentType": "passport",
            "travelDocumentNumber": "110101199001011234",
            "travelDocumentExpireDate": "2030-01-15",
            "nationality": "CN"
        }
    ],
    "seatClassId": "erdengzuo",
    "snapUpDeadline": 1784505600000,
    "callbackUrl": "https://buyer.example.com/callbacks/train/order",
    "preSaleConfirmationCallbackUrl": "https://buyer.example.com/callbacks/train/pre-sale",
    "china12306Account": {
        "account": "zhangsan"
    },
    "preference": {
        "chooseSeats": "1A1D",
        "chooseBeds": "123",
        "allowStanding": false,
        "carNumber": 8
    },
    "returnPreference": {
        "chooseSeats": "1A1D",
        "chooseBeds": "123",
        "allowStanding": false,
        "carNumber": 8
    }
}